WGU Math for Educators D128

Sum of a polygon - answer-(n-2)180 Right angle - answer-90 degrees acute angle - answer-less than 90 degrees obtuse angle - answer-greater than 90 degrees and less than 180 degrees reflex angle - answer-greater than 180 degrees complementary angles - answer-Two angles whose sum is 90 degrees supplementary angles - answer-Two angles whose sum is 180 degrees interior angles of a polygon - answer-angles inside of a polygon triangle - answer-A polygon with three sides whose interior angles equal 180. isosceles triangle - answer-A triangle that has 2 equal sides. equilateral triangle - answer-a triangle with 3 equal sides (60 degrees) Triangle Inequality Theorem - answer-The sum of the lengths of any two sides of a triangle must be greater than the length of the third side scalene triangle - answer-no equal sides quadrilateral - answer-a four-sided polygon with interior angles adding to 360 degrees Parallelogram - answer-A quadrilateral with two pairs of parallel sides square - answer-A quadrilateral with 4 sides that are equal and has all 90 degree angles rectangle - answer-a parallelogram with 4 right angles Rhombus - answer-A parallelogram with four congruent sides. Trapezoid - answer-A quadrilateral with exactly one pair of parallel sides isosceles trapezoid - answer-a trapezoid whose nonparallel opposite sides are congruent kite - answer-a quadrilateral with two pairs of adjacent sides congruent and no opposite sides congruent Hypotenuse - answer-the side of a right triangle opposite the right angle legs of a right triangle - answer-the sides adjacent to the right angle Pythagorean Theorem - answer-a²+b²=c² acute angle on a right triangle - answer-90 degrees circle - answer-The set of all points in a plane that are the same distance from a given point called the center diameter - answer-the distance across a circle through its center Radius - answer-The distance from the center of a circle to any point on the circle Tangent - answer-A line in the plane of a circle that intersects the circle in exactly one point. circumference - answer-The distance around a circle Circumference of a circle - answer-C=2πr or C=πd area - answer-The space inside the shape Area of a circle - answer-A=πr² Arcs - answer-a part of the circumference of a circle. sector - answer-The part of a circle that looks like a piece of pie. A sector is bounded by 2 radii and an arc of the circle. Solving for angles and arcs - answer-Central angle/360•=arc length/2πr= area of sector/πr² central angle - answer-Vertices are on the center of the circle inscribed angle - answer-an angle whose vertex is on the circle Transformation - answer-How figures can transform on the plane to make other figures. reflextion - answer-flipped Prime - answer-Mark on original vertices Rotation - answer-Movement around a fixed point Dialation - answer-A transformation that enlarges or reduces a figure by a scale factor. Distance Formula - answer-d = √[( x₂ - x₁)² + (y₂ - y₁)²] Inscribed Angle Theorem - answer-1/2 intercepted arc Scale Factor of Dilation Formula - answer-New length/old length line of reflection - answer-A line that a figure is flipped across to create a mirror image of the original figure Refl